Asymmetric Rolling Processes in Metal Forming Systems

Asymmetric rolling is a metal‐forming technique in which deliberate differences in roll geometry, surface speed or frictional conditions generate an additional shear component in the deformation zone. Unlike conventional symmetric rolling, which imposes a simple compressive strain, the asymmetric approach yields a combined rolling‐and‐shear strain state that promotes more uniform through‐thickness deformation, refines microstructure and alters crystallographic texture. By selecting particular roll diameter ratios or speed mismatches, engineers can tailor the distribution of strain to improve mechanical properties such as strength, ductility and isotropy. This process has found application in the production of lightweight aluminium and magnesium alloy sheets, ultra‐fine‐grained steel strips and advanced superalloys, offering reduced rolling forces, enhanced flatness and the capacity to process larger sheets than many severe plastic deformation methods. The ability to manipulate texture evolution also opens pathways to optimise formability in subsequent fabrication steps and to engineer final components with bespoke performance characteristics.

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Asymmetric Rolling Processes in Metal Forming Systems publication trend

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Technical terms

Asymmetric rolling: A rolling process in which rolls differ in diameter, speed or friction, introducing a shear component to the deformation.

Shear strain: Deformation characterised by sliding layers within the material, generated here by roll speed or diameter mismatch.

Crystallographic texture: The statistical distribution of grain orientations within a polycrystalline material, which influences anisotropy of properties.

Roll diameter ratio: The ratio of the diameters of the two work rolls, used to control the degree of asymmetry and resulting strain path.

Speed ratio: The ratio of peripheral velocities of the rolls, determining the magnitude and direction of the imposed shear.

Finite element method (FEM): A numerical technique for simulating material deformation and stress distributions under complex rolling conditions.

References

1. Effects of asymmetric rolling with tilted material entry on texture and mechanical properties of aluminium. Journal of Materials Processing Technology (2025).
2. Understanding the bending behavior and through-thickness strain distribution during asymmetrical rolling of high-strength aluminium alloy plates. Journal of Materials Research and Technology (2023).
3. A Short Review on the Finite Element Method for Asymmetric Rolling Processes. Metals (2021).
4. Asymmetric (Hot, Warm, Cold, Cryo) Rolling of Light Alloys: A Review. Metals (2021).
5. Asymmetrical Rolling of Aluminum Alloys and Steels: A Review. Metals (2020).